<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item
        v-for="(item, index) in levelList"
        :to="item.path"
        :key="item.path"
      >
        <span v-if="item.redirect === 'noRedirect'">
          <span v-if="index == levelList.length - 1" class="no-redirect">{{
            item.meta.title
          }}</span>
        </span>
        <a v-else>{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
// import pathToRegexp from "path-to-regexp";

export default {
  data() {
    return {
      levelList: null
    };
  },
  watch: {
    $route(route) {
      // if you go to the redirect page, do not update the breadcrumbs
      if (route.path.startsWith("/redirect/")) {
        return;
      }
      this.getBreadcrumb();
    }
  },
  created() {
    this.getBreadcrumb();
  },
  methods: {
    getBreadcrumb() {
      // only show routes with meta.title
      let matched = this.$route.matched.filter(
        item => item.meta && item.meta.title
      );

      this.levelList = matched.filter(
        item =>
          item.meta &&
          item.meta.title &&
          item.meta.breadcrumb !== false &&
          matched.length !== 1
      );
    }
  }
};
</script>

<style lang="less" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;
}
.no-redirect {
  color: #97a8be;
  cursor: text;
}
</style>
